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Strip type goaf control filling key parameter design method

A technology with key parameters and design methods, applied in the fields of backfill, mining equipment, earthwork drilling, etc., it can solve the problems of large backfill grouting, not considering the bearing performance of the remaining coal pillars, etc., so as to reduce backfill costs and improve backfill effects. , the effect of reducing the design amount

Active Publication Date: 2021-11-23
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a method for designing key parameters of strip-type goaf control filling to solve the problem of the lack of consideration of the bearing performance of the remaining coal pillars in the filling of coal mines after mining in the prior art. The technical problem of excessive filling and grouting

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  • Strip type goaf control filling key parameter design method
  • Strip type goaf control filling key parameter design method
  • Strip type goaf control filling key parameter design method

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Embodiment 1

[0059] In this embodiment, what needs to be filled and treated is a strip-type goaf in Jining, Shandong. The specific parameters of the goaf include: mining depth H is 500m, overlying rock bulk density gamma 24kN / m 3 , the width of the remaining coal pillar a 50m, the remaining coal pillar spacing b 50m, the remaining coal pillar height h is 3m, the uniaxial compressive strength of coal σ s is 10MPa, the internal friction angle of coal φ s is 30°, the lateral pressure coefficient of the elastic-plastic contact surface of the legacy coal pillar lambda s is 0.43, the coefficient of broken expansion of coal k is 1.2, the angle of repose of the stacked body φ r is 40°, the elastic modulus of coal E s 1.5GPa, filling width c c2 50m.

[0060] Due to the large width of strip mining, the strip coal pillar left in the strip goaf includes plastic zone and elastic core zone. The stripping of the legacy coal pillar will reduce the effective size of the coal pillar and i...

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Abstract

The invention provides a strip-type goaf control filling key parameter design method, which comprises the following steps that 1, coal and rock mass sampling is carried out on a left coal pillar in a strip-type goaf, physical and mechanical parameters of the coal and rock mass are obtained through testing, and the physical and mechanical parameters comprise the breaking and expanding coefficient of coal and the angle of repose of an accumulation body; 2, determining the maximum stripping depth of the left coal pillar according to the measured physical and mechanical parameters of the coal-rock mass; 3, determining the safety coefficient of the left coal pillar according to the maximum stripping depth of the left coal pillar; 4, whether filling treatment needs to be conducted on the goaf or not is determined according to the safety coefficient of the left coal pillar, and a filling treatment mode and control filling parameters are determined; according to the method, the bearing performance of the coal pillars left in the goaf is fully utilized, the filling effect of the strip type goaf is improved, and the filling cost of the strip type goaf is reduced.

Description

technical field [0001] The invention belongs to the field of coal mine subsidence prevention and control, and relates to goaf control filling parameters, in particular to a design method for key parameters of strip type goaf control filling. Background technique [0002] In order to effectively control the surface subsidence after coal mining, strip mining, as one of the effective means of coal mining for buildings and structures, is widely used in my country, and has been carried out in more than 10 provinces and more than 100 strip working faces. Strip mining, and mining over the years has formed a large number of strip goafs. [0003] At present, for strip goafs, the common method of goaf management is still used, the slurry full-fill grouting method. The slurry full-fill grouting method has the advantages of simple construction, fundamental treatment, and wide application range. However, the remaining voids in the strip-type goaf are large, and the amount of full fillin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13E21F15/00G06F119/14
CPCG06F30/13E21F15/00G06F2119/14
Inventor 许刚刚王晓东杨建朱世彬武博强冯龙飞李渊王海
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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